diff --git a/ci/environments/scenario001-multinode-containers.yaml b/ci/environments/scenario001-multinode-containers.yaml
index 73dc5b1454..a3bc8fcf6e 100644
--- a/ci/environments/scenario001-multinode-containers.yaml
+++ b/ci/environments/scenario001-multinode-containers.yaml
@@ -109,6 +109,7 @@ parameter_defaults:
   CephMonKey: 'AQC+Ox1VmEr3BxAALZejqeHj50Nj6wJDvs96OQ=='
   CephAdminKey: 'AQDLOh1VgEp6FRAAFzT7Zw+Y9V6JJExQAsRnRQ=='
   CephClientKey: 'AQC+vYNXgDAgAhAAc8UoYt+OTz5uhV7ItLdwUw=='
+  CephPoolDefaultSize: 1
   NovaEnableRbdBackend: true
   CinderEnableRbdBackend: true
   CinderBackupBackend: ceph
diff --git a/ci/environments/scenario004-multinode-containers.yaml b/ci/environments/scenario004-multinode-containers.yaml
index 6d795f97e5..5590de266e 100644
--- a/ci/environments/scenario004-multinode-containers.yaml
+++ b/ci/environments/scenario004-multinode-containers.yaml
@@ -95,6 +95,7 @@ parameter_defaults:
   CephMonKey: 'AQC+Ox1VmEr3BxAALZejqeHj50Nj6wJDvs96OQ=='
   CephAdminKey: 'AQDLOh1VgEp6FRAAFzT7Zw+Y9V6JJExQAsRnRQ=='
   CephClientKey: 'AQC+vYNXgDAgAhAAc8UoYt+OTz5uhV7ItLdwUw=='
+  CephPoolDefaultSize: 1
   SwiftCeilometerPipelineEnabled: false
   NeutronServicePlugins: 'router, networking_bgpvpn.neutron.services.plugin.BGPVPNPlugin'
   BgpvpnServiceProvider: 'BGPVPN:Dummy:networking_bgpvpn.neutron.services.service_drivers.driver_api.BGPVPNDriver:default'